WO2008004728A1 - Apparatus for measuring supporting stiffness of track - Google Patents

Apparatus for measuring supporting stiffness of track Download PDF

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Publication number
WO2008004728A1
WO2008004728A1 PCT/KR2006/005528 KR2006005528W WO2008004728A1 WO 2008004728 A1 WO2008004728 A1 WO 2008004728A1 KR 2006005528 W KR2006005528 W KR 2006005528W WO 2008004728 A1 WO2008004728 A1 WO 2008004728A1
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WO
WIPO (PCT)
Prior art keywords
measuring
supporting
load
weight body
measuring means
Prior art date
Application number
PCT/KR2006/005528
Other languages
French (fr)
Inventor
Dae-Sang Kim
Su-Hyung Lee
Original Assignee
Korea Railroad Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Railroad Research Institute filed Critical Korea Railroad Research Institute
Publication of WO2008004728A1 publication Critical patent/WO2008004728A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B35/00—Applications of measuring apparatus or devices for track-building purposes
    • E01B35/12—Applications of measuring apparatus or devices for track-building purposes for measuring movement of the track or of the components thereof under rolling loads, e.g. depression of sleepers, increase of gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing

Definitions

  • the present invention relates to an apparatus for measuring supporting the stiffness of track; and, more particularly, to an apparatus for measuring the supporting stiffness of track, which can quantitatively evaluate settlement to a maintenance repair limitation by measuring 7mm settlement, which is a maintenance repair limitation of an express railroad, determine whether the repair for maintenance, which will be referred to as maintenance repair herein, is in urgent need by checking a result value shown in a displaying unit, and easily move the measurement apparatus to a desired place even by the power of one person through a rail.
  • the settlement of the gravelly layer on road causes twist of track and separation of sleeper to thereby decrease comfort of a railroad vehicle and deteriorate safety of driving.
  • a track support state needs to be quantitatively evaluated for maintenance repair.
  • a method for easily and simply quantifying supporting stiffness is not generalized at present.
  • objective and quantitative data for supporting stiffness are required to determine a priority order of the maintenance repair and perform planned maintenance repairs .
  • Fig. 1 shows a conventional portable light falling weight deflectometer (LFWD) .
  • the portable LFWD is a device for falling a weight 2 connected to a supporting axis 1 at a predetermined height, measuring load and displacement from impact generated by the weight 2 based on a load cell 4 and a displacement measurer 5, and calculating dynamic elastic modulus of ground with a laptop computer 7 based on the load and the displacement.
  • a rubber buffer 3 alleviates the impact by the weight and a loading plate 6 is placed on the ground to be measured.
  • the portable LFWD has an advantage that it can perform measurement in a region where a vehicle can hardly access or a region where a loading apparatus such as a boring machine can not access.
  • the portable LFWD since the portable LFWD has a limited displacement measurement range of 2.2mm, the portable LFWD may not measure diverse displacements occurring in the railroad. Also, when the portable LFWD is used on railroad, its motion is limited.
  • the portable LFWD measures a dynamic elastic modulus to evaluate ground supporting strength of the road.
  • a supporting stiffness coefficient should be evaluated through calculation to evaluate the supporting strength, which is troublesome.
  • An embodiment of the present invention is directed to providing an apparatus for measuring supporting stiffness of track which can evaluate the extent of settlement to a maintenance repair limitation by measuring 7mm settlement, which is a maintenance repair limitation of an express railroad, determine whether the maintenance repair is urgent by checking a result value shown in a displaying unit, and move the measurement apparatus to a desired place by the power of one person through the railroad.
  • an apparatus for measuring supporting stiffness of track including: a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measuring load caused when the weight body vertically falls, and measuring displacement caused by the load; and a data processing means which is electronically connected to the measuring means, and processes and displays data of the load and the displacement measured in the measuring means.
  • At least one protrusion may be formed in the axial direction such that the weight body is held at a predetermined height.
  • the weight body may include at least one weight.
  • the buffering means may be a rubber plate having a plurality of protrusions.
  • the measuring means may include: a load cell for measuring vertical fall load of the weight body; and a displacement sensor positioned in a lower part of the load cell and measures displacement of track caused by the vertical fall load. The displacement sensor may measure the displacement up to 7mm.
  • the data processing means may include: an analog-to- digital board for converting an analog signal measured by the measuring means into a digital signal; a calculating means for calculating a supporting stiffness coefficient based on the load and the displacement measured by the measuring means; and a displaying unit for visually showing the supporting stiffness coefficient calculated in the calculating means.
  • the displaying unit may be a Liquid Crystal Display (LCD) .
  • the apparatus for measuring supporting stiffness of track includes a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measuring load caused when the weight body vertically falls, and measuring displacement caused by the load; a data processing means electronically connected to the measuring means, and processing and displaying data of the load and the displacement measured in the measuring means; and a supporting means connected to both sides of the rail when the measuring means is positioned on rail and supports both sides of the measuring means.
  • the supporting means may be a rubber spring.
  • the apparatus for measuring supporting stiffness of track may include a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measures load caused when the weight body vertically falls, and measures displacement caused by the load; a data processing means electronically connected to the measuring means, and processes and displays data of the load and the displacement measured in the measuring means; and a moving means for loading and moving the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means to a desired location on rail.
  • the moving means may include: a loading unit which is formed of a box format to load the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means; a handle extended to upward from one side of the loading unit to push or pull the loading unit; and a wheel unit positioned in a lower part of the loading unit to be rotated.
  • the wheel unit should have an insulating function for preventing that track current flows on rail.
  • the wheel unit may include: a rotary axis horizontally positioned in a lower part of the loading unit to be rotatable; and a couple of circular plates connected to both sides of the rotary axis and faces each other.
  • An apparatus for measuring supporting stiffness of track can quantitatively evaluate the extent of settlement to a maintenance repair limitation by measuring 7mm settlement, which is a maintenance repair limitation of an express railroad, determine whether the maintenance is urgent by checking a result value shown in a displaying unit, and move the measurement apparatus to a desired place by the power of one person through the railroad.
  • Fig. 1 shows a conventional apparatus for measuring a dynamic elastic modulus.
  • Fig. 2 shows an apparatus for measuring supporting stiffness of track in accordance with a first embodiment of the present invention.
  • Fig. 3 shows a usage status of the apparatus for measuring supporting stiffness of track in accordance with a second embodiment of the present invention.
  • Fig. 4 shows a moving means of the apparatus for measuring supporting stiffness of track in accordance with a third embodiment of the present invention.
  • FIG. 2 to 4 show an apparatus for measuring supporting stiffness of track in accordance with embodiments of the present invention.
  • the apparatus for measuring supporting stiffness of track includes a supporting axis 10, a weight body 20, a buffering means 30, a measuring means 40, and a data processing means 50 as shown in Fig. 2.
  • At least one protrusion 12 is formed in a circumference of the supporting axis 10 in an axial direction such that the weight body 20 is held at a predetermined height for free fall and vertically falls.
  • the weight body 20 is connected to the supporting axis 10 such that the weight body 20 can vertically fall at the predetermined height in an axial direction of the supporting axis 10.
  • the weight body 20 includes at least one weight.
  • the weight has a circular plate format with a predetermined thickness.
  • a plurality of weights having diverse weights may be connected to the supporting axis 10 and used according to measurement conditions.
  • the buffering means 30 is positioned in a lower part of the supporting axis 10 to alleviate the impact caused when the weight body 20 vertically falls.
  • the buffering means 30 includes a rubber plate having a plurality of protrusions.
  • the measuring means 40 is positioned in a lower part of the buffering means 30. When the weight body 20 vertically falls, the measuring means 40 measures load and measures displacement caused by the load.
  • the measuring means 40 includes a load cell 42 and a displacement sensor 44.
  • the load cell 42 measures vertical fall load of the weight body 20. Since it is well-known, it will not be described in detail herein.
  • the displacement sensor 44 is positioned in a lower part of the load cell 42 and measures displacement of track caused by the vertical fall load. It may measure the displacement of track to settlement of 7mm, which is a maintenance repair limitation of an express railroad.
  • the data processing means 50 is electronically connected to the measuring means 40. The data processing means 50 processes and displays data of the load and displacement measured by the measuring means 40.
  • the data processing means 50 includes analog-to-digital (AD) board (not shown) for converting an analog signal measured by the measuring means 40 into a digital signal; a calculating means (not shown) for calculating a supporting stiffness coefficient based on the data of the load and the displacement measured by the measuring means 40; and a displaying unit (not shown) for visually showing the supporting stiffness coefficient calculated in the calculating means.
  • AD analog-to-digital
  • the displaying unit may include a Liquid Crystal Display (LCD) , and the calculating means may use commercialized software. Since the software is well-known, it will not be described in detail herein.
  • LCD Liquid Crystal Display
  • a conventional portable LFWD includes a complicated algorithm to calculate a dynamic elastic modulus of ground and uses a laptop computer or a Personal Digital Assistant (PDA) based on wireless communication to process data in order to calculate the dynamic elastic modulus of ground
  • the conventional portable LFWD is expensive. It is possible to improve economical efficiency including a calculating means in the form of software for evaluating the supporting stiffness coefficient of track in a data processing means of the present invention and using a wired small data processor .
  • the apparatus for measuring supporting stiffness of track according to a second embodiment of the present invention further includes a supporting means 60 in addition to the configuration of the first embodiment as shown in Fig. 3.
  • the supporting means 60 When the measuring means 40 is positioned on rail R, the supporting means 60 is laid on both sides of the rail R and supports the measuring means 40 in both sides.
  • the supporting means 60 may be formed of a rubber spring.
  • the conventional portable LFWD uses loading plates of diverse sizes to measure the dynamic elastic modulus of ground.
  • a loading plate is not required.
  • the apparatus for measuring supporting stiffness of track further includes a moving means 70 in addition to the configuration of the first embodiment.
  • the moving means 70 moves a load of the supporting axis 10; the weight body 20; the buffering means 30; the measuring means 40; and the data processing means 50 shown in Fig. 2 to a desired location on rail.
  • the moving means 70 includes a loading unit 72 of a box shape; a handle 74 which is extended upward from one side of the loading unit 72 to push or pull the loading unit 72; a wheel unit 76 positioned in a lower part of the loading unit 72 to be rotatable in order to load the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means.
  • the wheel unit 76 includes a rotary axis 76a positioned horizontally in a lower part of the loading unit 72 to be rotatable; and a couple of circular plates 76b which are connected to both ends of the rotary axis 76a and face each other.
  • the distance between a couple of circular plates 76b is longer than the width of the rail, and the wheel unit 76 is formed of an insulating material.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

Provided is an apparatus for measuring supporting stiffness of track. The apparatus is positioned in a lower part of a supporting axis; a weight body; a buffering means; a measuring means measuring load, and measuring displacement caused by the load, and a data processing means. The apparatus further includes: a supporting means connected to both sides of the rail and supports both sides of the measuring means; and a moving means for loading and moving the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means to a desired location on rail. The apparatus may quantitatively evaluate settlement to a maintenance repair limitation by measuring 7mm settlement, determine whether the repair for maintenance is in urgent need by checking a result value shown in a displaying unit, and easily move the measurement apparatus to a desired place.

Description

DESCRIPTION
APPARATUS FOR MEASURING SUPPORTING STIFFNESS OF TRACK
TECHNICAL FIELD The present invention relates to an apparatus for measuring supporting the stiffness of track; and, more particularly, to an apparatus for measuring the supporting stiffness of track, which can quantitatively evaluate settlement to a maintenance repair limitation by measuring 7mm settlement, which is a maintenance repair limitation of an express railroad, determine whether the repair for maintenance, which will be referred to as maintenance repair herein, is in urgent need by checking a result value shown in a displaying unit, and easily move the measurement apparatus to a desired place even by the power of one person through a rail.
BACKGROUND ART
Since gravel forming a gravelly layer on road has a large grain size, there is a gap between pieces of gravel. The gap is the largest right after construction of track and gradually decreases as trains are driven by over the track repeatedly.
Even if construction is perfect, the density of a gravelly layer on road differs according to each location and this makes the settlement different according to each location.
The settlement of the gravelly layer on road causes twist of track and separation of sleeper to thereby decrease comfort of a railroad vehicle and deteriorate safety of driving.
Therefore, repair for maintenance is necessarily required to solve the above problems.
A track support state needs to be quantitatively evaluated for maintenance repair. However, a method for easily and simply quantifying supporting stiffness is not generalized at present.
Also, objective and quantitative data for supporting stiffness are required to determine a priority order of the maintenance repair and perform planned maintenance repairs .
Fig. 1 shows a conventional portable light falling weight deflectometer (LFWD) .
As shown in Fig. 1, the portable LFWD is a device for falling a weight 2 connected to a supporting axis 1 at a predetermined height, measuring load and displacement from impact generated by the weight 2 based on a load cell 4 and a displacement measurer 5, and calculating dynamic elastic modulus of ground with a laptop computer 7 based on the load and the displacement.
In Fig. 1, a rubber buffer 3 alleviates the impact by the weight and a loading plate 6 is placed on the ground to be measured.
The portable LFWD has an advantage that it can perform measurement in a region where a vehicle can hardly access or a region where a loading apparatus such as a boring machine can not access.
However, since the portable LFWD has a limited displacement measurement range of 2.2mm, the portable LFWD may not measure diverse displacements occurring in the railroad. Also, when the portable LFWD is used on railroad, its motion is limited.
In addition, the portable LFWD measures a dynamic elastic modulus to evaluate ground supporting strength of the road. However, when the portable LFWD is applied to the railroad, a supporting stiffness coefficient should be evaluated through calculation to evaluate the supporting strength, which is troublesome.
DISCLOSURE TECHNICAL PROBLEM
An embodiment of the present invention is directed to providing an apparatus for measuring supporting stiffness of track which can evaluate the extent of settlement to a maintenance repair limitation by measuring 7mm settlement, which is a maintenance repair limitation of an express railroad, determine whether the maintenance repair is urgent by checking a result value shown in a displaying unit, and move the measurement apparatus to a desired place by the power of one person through the railroad.
TECHNICAL SOLUTION
In accordance with an aspect of the present invention, there is provided an apparatus for measuring supporting stiffness of track, including: a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measuring load caused when the weight body vertically falls, and measuring displacement caused by the load; and a data processing means which is electronically connected to the measuring means, and processes and displays data of the load and the displacement measured in the measuring means.
In a circumference of the supporting axis, at least one protrusion may be formed in the axial direction such that the weight body is held at a predetermined height. The weight body may include at least one weight. The buffering means may be a rubber plate having a plurality of protrusions. The measuring means may include: a load cell for measuring vertical fall load of the weight body; and a displacement sensor positioned in a lower part of the load cell and measures displacement of track caused by the vertical fall load. The displacement sensor may measure the displacement up to 7mm.
The data processing means may include: an analog-to- digital board for converting an analog signal measured by the measuring means into a digital signal; a calculating means for calculating a supporting stiffness coefficient based on the load and the displacement measured by the measuring means; and a displaying unit for visually showing the supporting stiffness coefficient calculated in the calculating means. The displaying unit may be a Liquid Crystal Display (LCD) .
The apparatus for measuring supporting stiffness of track according to a second embodiment of the present invention includes a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measuring load caused when the weight body vertically falls, and measuring displacement caused by the load; a data processing means electronically connected to the measuring means, and processing and displaying data of the load and the displacement measured in the measuring means; and a supporting means connected to both sides of the rail when the measuring means is positioned on rail and supports both sides of the measuring means.
The supporting means may be a rubber spring. The apparatus for measuring supporting stiffness of track according to a third embodiment of the present invention may include a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measures load caused when the weight body vertically falls, and measures displacement caused by the load; a data processing means electronically connected to the measuring means, and processes and displays data of the load and the displacement measured in the measuring means; and a moving means for loading and moving the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means to a desired location on rail.
The moving means may include: a loading unit which is formed of a box format to load the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means; a handle extended to upward from one side of the loading unit to push or pull the loading unit; and a wheel unit positioned in a lower part of the loading unit to be rotated. The wheel unit should have an insulating function for preventing that track current flows on rail. The wheel unit may include: a rotary axis horizontally positioned in a lower part of the loading unit to be rotatable; and a couple of circular plates connected to both sides of the rotary axis and faces each other.
ADVANTAGEOUS EFFECTS
An apparatus for measuring supporting stiffness of track according to the present invention can quantitatively evaluate the extent of settlement to a maintenance repair limitation by measuring 7mm settlement, which is a maintenance repair limitation of an express railroad, determine whether the maintenance is urgent by checking a result value shown in a displaying unit, and move the measurement apparatus to a desired place by the power of one person through the railroad.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a conventional apparatus for measuring a dynamic elastic modulus.
Fig. 2 shows an apparatus for measuring supporting stiffness of track in accordance with a first embodiment of the present invention.
Fig. 3 shows a usage status of the apparatus for measuring supporting stiffness of track in accordance with a second embodiment of the present invention.
Fig. 4 shows a moving means of the apparatus for measuring supporting stiffness of track in accordance with a third embodiment of the present invention.
BEST MODE FOR THE INVENTION
The preferred embodiments of the present invention will be described in detail hereinafter with reference to the attached drawings. Figs. 2 to 4 show an apparatus for measuring supporting stiffness of track in accordance with embodiments of the present invention.
The apparatus for measuring supporting stiffness of track according to the first embodiment of the present invention includes a supporting axis 10, a weight body 20, a buffering means 30, a measuring means 40, and a data processing means 50 as shown in Fig. 2.
It is preferred that at least one protrusion 12 is formed in a circumference of the supporting axis 10 in an axial direction such that the weight body 20 is held at a predetermined height for free fall and vertically falls.
The weight body 20 is connected to the supporting axis 10 such that the weight body 20 can vertically fall at the predetermined height in an axial direction of the supporting axis 10. The weight body 20 includes at least one weight.
The weight has a circular plate format with a predetermined thickness. A plurality of weights having diverse weights may be connected to the supporting axis 10 and used according to measurement conditions.
The buffering means 30 is positioned in a lower part of the supporting axis 10 to alleviate the impact caused when the weight body 20 vertically falls. The buffering means 30 includes a rubber plate having a plurality of protrusions.
The measuring means 40 is positioned in a lower part of the buffering means 30. When the weight body 20 vertically falls, the measuring means 40 measures load and measures displacement caused by the load. The measuring means 40 includes a load cell 42 and a displacement sensor 44.
The load cell 42 measures vertical fall load of the weight body 20. Since it is well-known, it will not be described in detail herein. The displacement sensor 44 is positioned in a lower part of the load cell 42 and measures displacement of track caused by the vertical fall load. It may measure the displacement of track to settlement of 7mm, which is a maintenance repair limitation of an express railroad. The data processing means 50 is electronically connected to the measuring means 40. The data processing means 50 processes and displays data of the load and displacement measured by the measuring means 40. The data processing means 50 includes analog-to-digital (AD) board (not shown) for converting an analog signal measured by the measuring means 40 into a digital signal; a calculating means (not shown) for calculating a supporting stiffness coefficient based on the data of the load and the displacement measured by the measuring means 40; and a displaying unit (not shown) for visually showing the supporting stiffness coefficient calculated in the calculating means.
The displaying unit may include a Liquid Crystal Display (LCD) , and the calculating means may use commercialized software. Since the software is well- known, it will not be described in detail herein.
Since a conventional portable LFWD includes a complicated algorithm to calculate a dynamic elastic modulus of ground and uses a laptop computer or a Personal Digital Assistant (PDA) based on wireless communication to process data in order to calculate the dynamic elastic modulus of ground, the conventional portable LFWD is expensive. It is possible to improve economical efficiency including a calculating means in the form of software for evaluating the supporting stiffness coefficient of track in a data processing means of the present invention and using a wired small data processor .
The apparatus for measuring supporting stiffness of track according to a second embodiment of the present invention further includes a supporting means 60 in addition to the configuration of the first embodiment as shown in Fig. 3.
When the measuring means 40 is positioned on rail R, the supporting means 60 is laid on both sides of the rail R and supports the measuring means 40 in both sides. The supporting means 60 may be formed of a rubber spring.
The conventional portable LFWD uses loading plates of diverse sizes to measure the dynamic elastic modulus of ground. However, since the present invention should give load on the rail and the sleepers, a loading plate is not required.
According to the third embodiment of the present invention, the apparatus for measuring supporting stiffness of track further includes a moving means 70 in addition to the configuration of the first embodiment.
The moving means 70 moves a load of the supporting axis 10; the weight body 20; the buffering means 30; the measuring means 40; and the data processing means 50 shown in Fig. 2 to a desired location on rail. The moving means 70 includes a loading unit 72 of a box shape; a handle 74 which is extended upward from one side of the loading unit 72 to push or pull the loading unit 72; a wheel unit 76 positioned in a lower part of the loading unit 72 to be rotatable in order to load the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means. The wheel unit 76 includes a rotary axis 76a positioned horizontally in a lower part of the loading unit 72 to be rotatable; and a couple of circular plates 76b which are connected to both ends of the rotary axis 76a and face each other. Herein, the distance between a couple of circular plates 76b is longer than the width of the rail, and the wheel unit 76 is formed of an insulating material. While the present invention has been described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims

WHAT IS CLAIMED IS:
1. An apparatus for measuring supporting stiffness of track, comprising: a supporting axis; a weight body connected to the supporting axis to vertically fall at a predetermined height in an axial direction of the supporting axis; a buffering means positioned in a lower part of the supporting axis and alleviating impact caused when the weight body vertically falls; a measuring means positioned in a lower part of the buffering means, measures load when the weight body vertically falls, and measuring displacement caused by the load; and a data processing means electronically connected to the measuring means, and processing and displaying data of the load and the displacement measured by the measuring means.
2. The apparatus of claim 1, wherein in a circumference of the supporting axis, at least one protrusion is formed in the axial direction such that the weight body is held at a predetermined height.
3. The apparatus of claim 1, wherein the weight body includes at least one weight.
4. The apparatus of claim 1, wherein the buffering means is a rubber plate having a plurality of protrusions.
5. The apparatus of claim 1, wherein the measuring means includes: a load cell for measuring vertical fall load of the weight body; and a displacement sensor positioned in a lower part of the load cell and measures displacement of track caused by the vertical fall load.
6. The apparatus of claim 5, wherein the displacement sensor measures the displacement up to 7mm.
7. The apparatus of claim 1, wherein the data processing means includes: an analog-to-digital board for converting an analog signal measured by the measuring means into a digital signal; a calculating means for calculating a supporting stiffness coefficient based on the load and the displacement measured by the measuring means; and a displaying unit for visually showing the supporting stiffness coefficient calculated in the calculating means.
8. The apparatus of claim 7, wherein the displaying unit is formed of a Liquid Crystal Display (LCD) .
9. The apparatus of claim 1, further comprising: a supporting means which is connected to both sides of the rail when the measuring means is positioned on rail and supports both sides of the measuring means.
10. The apparatus of claim 1, wherein the supporting means is formed of a rubber spring.
11. The apparatus of claim 1, further comprising: a moving means for loading and moving the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means to a desired location on rail.
12. The apparatus of claim 11, wherein the moving means includes: a loading unit formed in a box shape to load the supporting axis, the weight body, the buffering means, the measuring means, and the data processing means; a handle extended upward from one side of the loading unit to push or pull the loading unit; and a wheel unit positioned in a lower part of the loading unit to be rotatable.
13. The apparatus of claim 12, wherein the wheel unit has an insulation property to insulate track current flowing on rail.
14. The apparatus of claim 13, wherein the wheel unit includes: a rotary axis horizontally positioned in a lower part of the loading unit to be rotatable; and a couple of circular plates connected to both sides of the rotary axis and face each other.
15. The apparatus of claim 14, wherein a distance between the circular plates is longer than a width of the rail.
PCT/KR2006/005528 2006-07-06 2006-12-18 Apparatus for measuring supporting stiffness of track WO2008004728A1 (en)

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KR1020060063624A KR100784799B1 (en) 2006-07-06 2006-07-06 Apparatus for measuring stiffness of track

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JP2014234693A (en) * 2013-06-05 2014-12-15 公益財団法人鉄道総合技術研究所 Quality control method of ballast track
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CN112414651A (en) * 2020-11-27 2021-02-26 中国铁道科学研究院集团有限公司 Track rigidity determination method and device based on mobile line loading vehicle
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